Shunga Series - Phallic Contests

Representation of larger-than-life phalluses is one of shunga’s most memorable features. Such depiction is often explained to have originated in so-called kachi-e, a painting of a phallic contest (yōbutsu kurabe) among men with surrealistically huge male members.

A great article on the Phallic Contest can be read at the following link.
Historiography of the “Phallic Contest” Handscroll in Japanese Art (AkikoYano)

Amazing Images of Classic Japanese Phallic Contests

 

The women are inspecting the men in this contest

Shunga Series - Animals

In Shunga there is a lot of emphesis on animals either as the sexual object or as an amusing side note to a image, the animals are usually copying the couple in the image.